Arithmetricks: 50 Easy Ways to Add, Subtract, Multiply, and Divide Without a Calculator by Edward H. Julius (Paperback, 1995)

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Arithmetricks : 50 Easy Ways to Add, Subtract, Multiply, and Divide Without a Calculator, Paperback by Julius, Edward H., ISBN 0471106399, ISBN-13 9780471106395, Brand New, Free P&P in the UK Provides instructions for shortcuts of varying degrees of difficulty for doing arithmetical calculations and estimates, and for checking answers